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I have an old mobile home that has and old duo therm thermostat that is acting up. keeps cycling off for quite awhile and on for not so long. I purchased a honeywell ct-31-a. It only has places for 4 wires, my old duo therm m//n t-17H-135 N has 5 wires. I can read the w,g,y,and r on the old thermostat but not the 5th terminal. what do I do.

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If you want just heat, connect the red wire to the R terminal, the White wire to the W terminal and the green wire to the G terminal. Confirm that these same wires go to the same terminals on the control in your furnace. If you want both heat and air conditioning, connect a jumper from R to R2. Keep the wires the same as I described and put the yellow wire on the Y terminal.

Posted on Feb 01, 2010

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